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Table 1 Severity scale according to Bland [22] that was used to grade nerve conduction measurement results

From: Predictors of the patient-centered outcomes of surgical carpal tunnel release – a prospective cohort study

0 Normal DML less than 4.1 ms; normal DSL (DSL less than 2.8 ms)
1 Mild DML < 4.1 ms; slow DSL (2.8 ≤ DSL < 4.1)
2 Moderate 4.1 ≤ DML < 6.5; DSL any value except for conduction block
3 Severe 4.1 ≤ DML < 6.5 ms; DSL conduction block
4 Very severe 6.5 ≤ DML; DSL any value
5 Extremely severe DML conduction block; DSL conduction block
  1. DML distal motor latencies, DSL distal sensory latencies